Premixing device for assisting methanol combustion

Abstract

The invention discloses a premixing device for assisting methanol combustion, which comprises a premixing chamber provided with a gas inlet pipe and a gas exhaust valve in a communicating manner, and a gas injection assembly arranged in the premixing chamber and positioned at the gas outlet end of the gas inlet pipe, and the gas injection assembly comprises a gas exhaust sleeve movably arranged in the premixing chamber and communicated with a gas injection pipe; a water injection pipe is communicated with one side of the gas injection pipe; and one side of the premixing chamber is communicated with the air cylinder, and a rotary stirring mechanism is arranged at the communication position. The exhaust sleeve is movably arranged at the position of the gas inlet pipe, the contact area between methanol gas and air or oxygen is increased in the axial movement direction and the longitudinal direction of the gas injection position, and the premixing efficiency of the methanol gas can be effectively improved and guaranteed; and meanwhile, the water injection pipe is arranged to be used for removing dead angles of gas residues, so that the use safety can be kept while the premixing efficiency is effectively guaranteed.

Description

Technical Field

[0001] This invention relates to the field of industrial burner technology, and in particular to a premixing device for assisting methanol combustion. Background Technology

[0002] Methanol is an internationally recognized clean fuel. As an oxygen-containing compound, its combustion emissions are significantly lower than those of petroleum combustion. However, methanol still has characteristics including toxicity, flammability, explosiveness, and corrosiveness. When used as a fuel, it is still necessary to ensure the combustion efficiency of methanol, especially in the premixing stage before combustion. Natural mixing of gases under a certain pressure is unstable, and the cycle required to achieve a certain mixing ratio is also relatively long. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a premixing device for assisting methanol combustion that can improve the methanol premixing efficiency.

[0004] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide a premixing device for assisting methanol combustion, including a premixing chamber connected to an inlet pipe and an exhaust valve, and an injection assembly disposed in the premixing chamber and located at the outlet end of the inlet pipe. The injection assembly includes an exhaust sleeve movably disposed in the premixing chamber and connected to the injection pipe, and a water injection pipe connected to one side of the injection pipe; and a stirring mechanism disposed at the connection position between the premixing chamber and a combustion chamber.

[0005] With the above structure, an intake pipe injects oxygen or air into the premixing chamber, while a gas injection pipe simultaneously inputs methanol gas into the exhaust sleeve in the injection assembly. Because the exhaust sleeve is located within the premixing chamber and movable at the outlet end of the intake pipe, the contact range between the methanol gas and air or oxygen is increased, effectively improving the mixing efficiency of the methanol gas. Furthermore, to ensure safe operation, especially during maintenance, it is necessary to prevent the residue of methanol gas in the premixing chamber, particularly in the exhaust sleeve. A water injection pipe injects water into the exhaust sleeve to expel any residual methanol gas. The discharged residual gas is then safely released into the atmosphere after being treated by an exhaust valve, ensuring the safety of the installation and usage location. The included stirring mechanism allows the premixed methanol gas to enter the cylinder in a rotating state, achieving thorough premixing. The structure is simple and the operation is convenient.

[0006] To simplify the installation structure and assist in rotating the air, preferably, a connection hole is provided on one side of the premixing chamber, a bracket is provided in the connection hole, a first bearing is provided in the middle of the bracket, a first connecting rod is sleeved on the middle ring of the first bearing, and a first fan blade is provided on the outer side wall of the first connecting rod along the circumferential direction. One side of the air intake pipe is connected to the air pump, and the other side of the air intake pipe is connected to the outer opening of the connection hole.

[0007] To simplify the installation structure, preferably, the air injection assembly includes an air injection pipe that passes through the premixing chamber, a reciprocating motor located outside the premixing chamber and below the connection hole, a lead screw connected to the output end of the reciprocating motor and extending horizontally into the premixing chamber, a connecting block screwed to the lead screw, and an exhaust sleeve fixedly connected to the connecting block. A boss is provided on one side of the exhaust sleeve, and a through hole is provided on the boss. A guide rod connected to the inner wall of the premixing chamber on one side passes through the through hole.

[0008] To facilitate increased contact area between methanol gas and air and thus better mixing, the exhaust sleeve preferably includes a lower concave cavity that is arc-shaped and screwed to a connecting block, and an upper concave cavity that is screwed to the lower concave cavity. The inner walls of the upper and lower concave cavities together form an arc-shaped cavity structure. The gas injection pipe is located on one side of the lower concave cavity and communicates with the cavity structure. Multiple gas outlets communicating with the cavity structure are provided on the upper concave cavity along the arc direction.

[0009] To facilitate installation and limit the movement of the connecting block, preferably, a mounting plate is provided on the inner wall of the premixing chamber, with the upper end face of the mounting plate fitting against the lower end face of the connecting block; a first connecting plate is vertically provided on one side of the mounting plate, which is fixedly connected to the inner wall of the premixing chamber and allows the lead screw to pass through, and a second connecting plate is vertically provided on the other side to limit the movement of the connecting block.

[0010] To reduce the corrosion of the installation components by methanol gas and effectively ensure the service life of the installation components, preferably, a first telescopic tube is provided at the positions between the first connecting plate and the connecting block and between the connecting block and the second connecting plate, and the two ends of the first telescopic tubes are respectively abutting the end faces of the corresponding ends of the first connecting plate, the connecting block and the second connecting plate; a second telescopic tube is provided between the boss and the inner wall of the premixing chamber, and the two ends of the second telescopic tube are respectively abutting the boss and the inner wall of the premixing chamber.

[0011] For ease of disassembly, cleaning and maintenance, preferably, a screw hole is provided on the end face of the lower concave cavity, and a bent section is provided on the end face of the upper concave cavity. The upper concave cavity is fastened to the upper end of the lower concave cavity, and the lower end face of the bent section is in contact with the end face of the lower concave cavity. A bolt passes through the bent section and is screwed into the screw hole, and the nut of the bolt abuts against the upper end face of the bent section.

[0012] To facilitate the formation of a pressure trend for exhausting into the cylinder, preferably, a conical wall is provided on one side of the inner wall of the premixing chamber, and a gas-gathering hole is connected to the narrow end of the conical wall. A support sleeve is fixedly installed in the gas-gathering hole. The stirring assembly includes a second bracket fixedly embedded in the gas-gathering hole, a second bearing disposed on the second bracket, a second connecting rod sleeved on the middle ring of the second bearing and fitted with a second fan blade, and a gas guide sleeve connected to the second connecting rod and located in the gas-gathering hole. In use, the airflow input into the gas-gathering hole drives the second fan blade to rotate, and synchronously drives the gas guide sleeve to rotate so that the gas enters the combustion chamber in a spiral rotation.

[0013] To facilitate switching between air filling and water filling, preferably, the air inlet of the air filling pipe extends out of the premixing chamber, and the outlet of the air filling pipe is connected to a three-way valve. One side of the three-way valve is connected to a water pump via a water filling pipe, and the other side is connected to a methanol gas tank via a connecting pipe. A heating sleeve is fitted on the outer wall of the connecting pipe. Both the connecting pipe and the water filling pipe are equipped with switch valves.

[0014] To facilitate drainage in the premixing chamber and effectively control the safe handling of the exhaust gas, a drain valve is preferably provided at the lower end of the premixing chamber; the outlet of the exhaust valve is connected to the reaction cylinder, the reaction cylinder is filled with sodium hydroxide solution, and an adsorption tube is connected to one side of the reaction cylinder, the adsorption tube being filled with activated carbon.

[0015] Beneficial effects: The present invention movably sets an exhaust sleeve at the air inlet pipe position, which increases the contact area between methanol gas and air or oxygen in both the axial movement direction and the longitudinal direction of the gas injection position, effectively improving and ensuring the premixing efficiency of methanol gas; at the same time, a water injection pipe is set to eliminate dead corners of gas residue, which can effectively ensure the premixing efficiency while maintaining the safety of use. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 for Figure 1 Enlarged view of point A in the image.

[0018] Figure 3 for Figure 1 Enlarged view of point B in the image.

[0019] Figure 4 This is a schematic diagram of the exhaust sleeve.

[0020] Figure 5 This is a schematic diagram of the installation structure of the exhaust sleeve and the connecting hole.

[0021] The meanings of the labels in the attached diagram are as follows: Premixing chamber-1; Inlet pipe-10; Connection hole-100; Bracket-101; First bearing-102; First connecting rod-103; First fan blade-104; Air pump-105; Injection pipe-12; Three-way valve-121; Connecting pipe-122; Methanol gas tank-123; Heating jacket-124; Switch valve-13; Drain valve-14; Exhaust sleeve-2; Reciprocating motor-21; Lead screw-22; Connecting block-23; Boss-24; Guide rod-25; Lower cavity-26; Upper cavity-27; Air outlet-271; Bending section-272; Step plate-28; First connecting plate-281; ​​Second connecting plate-282; First telescopic tube-291; Second telescopic tube-292; Water injection pipe-3; air gathering hole-30; support sleeve-301; second bracket-31; second bearing-32; second connecting rod-33; second fan blade-331; air guide sleeve-34; reaction cylinder-35; adsorption pipe-36; cylinder-4. Detailed Implementation

[0022] Depend on Figures 1 to 5 As shown, the present invention includes a premixing chamber 1 connected to an air inlet pipe 10 and an exhaust valve 11, and an air injection assembly disposed in the premixing chamber 1 and located at the air outlet end of the air inlet pipe 10. The air injection assembly includes an exhaust sleeve 2 movably disposed in the premixing chamber 1 and connected to an air injection pipe 12, and a water injection pipe 3 connected to one side of the air injection pipe 12; and a cylinder 4 connected to one side of the premixing chamber 1, with a stirring mechanism provided at the connection position.

[0023] Specifically, a connection hole 100 is provided on one side of the premixing chamber 1, a bracket 101 is provided in the connection hole 100, a first bearing 102 is provided in the middle of the bracket 101, a first connecting rod 103 is sleeved on the middle ring of the first bearing 102, and a first fan blade 104 is provided on the outer side wall of the first connecting rod 103 along the circumferential direction. One side of the air inlet pipe 10 is connected to the air pump 105, and the other side of the air inlet pipe 10 is connected to the outer opening of the connection hole 100.

[0024] The air injection assembly includes an air injection pipe 20 that passes through the premixing chamber 1, a reciprocating motor 21 located outside the premixing chamber 1 and below the connection hole 100, a lead screw 22 connected to the output end of the reciprocating motor 21 and extending horizontally into the premixing chamber 1, a connecting block 23 screwed to the lead screw 22, and an exhaust sleeve 2 fixedly connected to the connecting block 23. A boss 24 is provided on one side of the exhaust sleeve 2, and a through hole is provided on the boss 24. A guide rod 25 connected to the inner wall of the premixing chamber 1 is inserted through the through hole.

[0025] The exhaust sleeve 2 includes a lower concave cavity 26 that is arc-shaped and screwed to the connecting block 23, and an upper concave cavity 27 that is fastened and screwed to the lower concave cavity 26. The upper concave cavity 27 and the inner wall of the lower concave cavity 26 together form an arc-shaped cavity structure. The air injection pipe 12 is provided on one side of the lower concave cavity 26 and communicates with the cavity structure. Multiple air outlets 271 communicating with the cavity structure are provided on the upper concave cavity 27 along the arc direction.

[0026] A mounting plate 28 is provided on the inner wall of the premixing chamber 1, and the upper end face of the mounting plate 28 is fitted with the lower end face of the connecting block 23. A first connecting plate 281 is vertically provided on one side of the mounting plate 28, which is fixedly connected to the inner wall of the premixing chamber 1 and through which the lead screw 22 passes. A second connecting plate 282 is vertically provided on the other side to limit the movement of the connecting block 23.

[0027] It also includes a first telescopic tube 291 sleeved on the outside of the lead screw 22 at the positions between the first connecting plate 281 and the connecting block 23 and between the connecting block 23 and the second connecting plate 282, with the two ends of the first telescopic tube 291 respectively abutting against the end faces of the corresponding ends of the first connecting plate 281, the connecting block 23 and the second connecting plate 282; and a second telescopic tube 292 sleeved on the outside of the guide rod 25 between the boss 24 and the inner wall of the premixing chamber 1, with the two ends of the second telescopic tube 292 abutting against the boss 24 and the inner wall of the premixing chamber 1 respectively.

[0028] To simplify the installation structure, a screw hole is provided on the cavity end face of the lower recess 26, and a bent section 272 is provided on the cavity end face of the upper recess 27. The upper recess 27 is fastened to the upper end of the lower recess 26, and the lower end face of the bent section 272 is in contact with the cavity end face of the lower recess 26. A bolt passes through the bent section 272 and is screwed into the screw hole. The nut of the bolt abuts against the upper end face of the bent section 272.

[0029] Additionally, a conical wall is provided on one side of the inner wall of the premixing chamber 1, and a gas-gathering hole 30 is provided at the narrow end of the conical wall. A support sleeve 301 is fixedly installed in the gas-gathering hole 30. The stirring assembly includes a second bracket 31 fixedly embedded in the gas-gathering hole 30, a second bearing 32 disposed on the second bracket 31, a second connecting rod 33 sleeved on the middle ring of the second bearing 32 and fitted with a second fan blade 331, and a guide sleeve 34 connected to the second connecting rod 33 and located in the gas-gathering hole 30. In use, the airflow input into the gas-gathering hole 30 drives the second fan blade 331 to rotate, and synchronously drives the guide sleeve 34 to rotate so that the gas enters the cylinder 4 in a spiral rotation.

[0030] For ease of use, the inlet end of the gas injection pipe 12 extends out of the premixing chamber 1. The outlet end of the gas injection pipe 12 is connected to a three-way valve 121. One side of the three-way valve 121 is connected to a water pump via a water injection pipe 3, and the other side is connected to a methanol gas tank 123 via a connecting pipe 122. A heating sleeve 124 is fitted on the outer wall of the connecting pipe 122. Both the connecting pipe 122 and the water injection pipe 3 are equipped with switch valves 13.

[0031] In addition, a drain valve 14 is provided at the lower end of the premixing chamber 1; the outlet end of the exhaust valve 11 is connected to the reaction cylinder 35, the reaction cylinder 35 is filled with sodium hydroxide solution, an adsorption tube 36 is connected to one side of the reaction cylinder 35, and activated carbon is filled in the adsorption tube 36.

[0032] The working principle of this invention is as follows: like Figures 1 to 5 As shown, during use, the air pump 105 is turned on, and air (or oxygen) is injected into the premixing chamber 1 through the air inlet pipe 10. Then, the switch valve 13 on the connecting pipe 122 and the heating jacket 124 are turned on, so that the methanol gas in the methanol tank 123 is discharged into the connecting pipe 122. Under the action of heat transfer from the heating jacket 124, the preheating purpose is achieved, so as to increase the molecular kinetic energy of the methanol gas and help improve the efficiency of gas mixing.

[0033] Heated methanol gas enters the exhaust sleeve 2 through the three-way valve 121 and the gas injection pipe 12. The exhaust sleeve 2 has an arc-shaped cavity structure formed by the inner walls of the upper concave cavity 27 and the lower concave cavity 26. The methanol gas is then discharged from multiple gas outlets 271 arranged along the arc-shaped direction. Figure 1 , Figure 4 and Figure 5As shown, the exhaust direction of the vent 271 is arranged around the outside of the exhaust end of the intake pipe 10. At this time, considering that the exhaust gas from the intake pipe 10 cannot come into contact with and mix with the methanol gas in time under pressure, the reciprocating motor 21 needs to be turned on at the same time to drive the lead screw 22 to reciprocate. That is, it drives the screwed connecting block 23 to reciprocate horizontally on the mounting plate 28. The exhaust sleeve 2 also moves synchronously and floats upward after the methanol gas is discharged. In this way, in the gas inflow direction of the intake pipe 10, the injected air (or oxygen) can be repeatedly injected in a reciprocating manner, so that the two flowing gases can be fully premixed during movement, and the impact of the gas pressure velocity on the gas mixing can be compensated.

[0034] During this process, the first telescopic tube 291 and the second telescopic tube 292 extend and retract adaptively to reduce the contact between methanol gas and the lead screw 22 and the guide rod 25, effectively reducing the chance of corrosion due to prolonged contact with methanol gas. The contact friction between the exposed position of the guide rod 25 and the through hole of the boss 24 can also eliminate rust spots to ensure smooth movement of the exhaust sleeve 2.

[0035] like Figure 3 As shown, the premixed gas moves along the conical wall to the gas-gathering hole 30, thus forming a tendency to accumulate and discharge. That is, under the same pressure, the gas-gathering hole 30 forms an accelerated discharge state. After the accelerated discharge of the mixed gas enters the support sleeve 301 in the gas-gathering hole 30, it drives the second fan blade 331 to rotate. Since the second fan blade 331 is sleeved on the connecting rod 33, and one end of the connecting rod 33 is sleeved and connected to the middle ring of the second bearing 32, and the other side of the connecting rod 33 is connected to the middle part of the air guide sleeve 34, the air guide sleeve 34 is driven to rotate synchronously so that the gas enters the cylinder 4 in a spiral rotation. During this process, the mixed gas can achieve the purpose of stirring and remixing, so that it is fully premixed when entering the cylinder 4.

[0036] Among them, such as Figure 2 As shown, the outlet end of the intake pipe 10 is connected to the outer opening of the connecting hole 100. A bracket 101 is provided inside the connecting hole 100. A first bearing 102 is provided in the middle of the bracket 101. A first connecting rod 103 is sleeved on the middle ring of the first bearing 102. A first fan blade 104 is provided on the outer side wall of the first connecting rod 103 along the circumferential direction. In this way, the exhaust air is also rotating. Combined with the multi-directional reciprocating movement of methanol gas in the intake direction, the mixing efficiency is effectively improved.

[0037] After use, first close the switch valve 13 on the connecting pipe 122, and the air pump 105 continues to inject gas into the air inlet pipe 10 to carry out the methanol gas in the premixing chamber 1 until the flame in the combustion chamber (not marked) is extinguished, and then close the air pump 105. When using it again, first turn on the air pump 105, inject air into the premixing chamber 1, and open the exhaust valve 11 to clean and adjust the gas content in the premixing chamber for the premixing operation.

[0038] It should be noted that, due to the corrosive nature of methanol gas, to prevent corrosion damage to the components in premixing chamber 1 and thus affecting its use, such as... Figure 1 As shown, a first telescopic tube 291 is provided at the positions between the first connecting plate 281 and the connecting block 23, and between the connecting block 23 and the second connecting plate 282, both of which are sleeved on the outside of the lead screw 22. The two ends of the first telescopic tube 291 abut against the end faces of the corresponding ends of the first connecting plate 281, the connecting block 23, and the second connecting plate 282, respectively. At the same time, a second telescopic tube 292 is provided between the boss 24 and the inner wall of the premixing chamber 1, sleeved on the outside of the guide rod 25. In this way, the lead screw 22 and the guide rod 25 are always covered by the telescopic tube, which greatly reduces the intensity of gas corrosion and ensures the smooth movement of the connecting block 23.

[0039] When it is found that the connecting block 23 moves or the premixing efficiency changes, maintenance is required. At this time, the switch valve 13 on the water injection pipe 3 needs to be opened, and the water pump and the exhaust valve 11 need to be turned on. The water flows through the three-way valve 121 and the air injection pipe 12 into the exhaust sleeve 2, and gradually fills the arc-shaped cavity structure formed by the upper concave cavity 27 and the lower concave cavity 26. The water filling squeezes out the residual gas in the cavity structure and discharges it through the exhaust valve 11 into the reaction cylinder 35 to react with the sodium hydroxide solution. The gas after the reaction then passes through the adsorption pipe 36, and the residual toxic gas particles are adsorbed by the activated carbon and finally flow into the atmosphere.

[0040] Finally, open the drain valve 14 to drain the water in the premix chamber, wipe the water off the inner wall of the premix chamber 1 and let it dry to prevent the moisture in the premixed gas from exceeding the standard and affecting combustion. In addition, in order to avoid affecting production, and considering that the drying time of the inner wall of the premix chamber 1 is required, the maintenance or regular repair cycle should be coordinated with the usage time. The specifics will not be elaborated here.

[0041] Such maintenance can also be set as a regular operation to maintain the safety and smoothness of use. This includes cleaning the exhaust sleeve 2. Specifically, after the aforementioned water injection and venting operation, drain the water again, open the top cover of the premixing chamber 1 (not shown), loosen the bolt that passes through the bending section 272 and is screwed into the bolt hole, and lift the upper concave cavity 27 upwards. The upper concave cavity 27 and the lower concave cavity 26 can then be cleaned separately. If the corrosion level requires replacement, remove the lower concave cavity 26 that is screwed into the connecting block 23. After cleaning or after replacing the new part, screw the upper and lower concave cavities 26 in sequence. The upper concave cavity 27 is fastened onto the lower concave cavity 26, and the lower end face of the bending section 272 is in contact with the cavity opening end face of the lower concave cavity 26. The bolt passes through the bending section 272 and is screwed into the bolt hole. The bolt nut abuts against the upper end face of the bending section 272. Then, reinstall the exhaust sleeve 2.

[0042] In light of the foregoing usage, for ease of daily use, the premixing chamber 1 is equipped with a top cover, and a glass plate (not shown) needs to be installed within the movement range of the connecting block 23 to observe the premixing state of the gas flow within the premixing chamber 1, as well as the water injection and venting status. Similarly, the installation of the top cover and the glass plate with the premixing chamber 1 must also meet the sealing requirements. Therefore, the structure of installing the cover plate in a normal chamber body is sufficient. At the same time, the specifications of the premixing chamber 1 should also be taken into account. Larger specifications require machine assistance to open, while smaller specifications can be opened manually by the operator. The specific configuration should be designed to facilitate operation. The structural configuration of the glass plate embedded in the top cover structure will not be described in detail here.

Claims

1. A premixing device to assist combustion of methanol, characterized by: The premixing chamber (1) is communicated with the air inlet pipe (10) and the exhaust valve (11), the air injection assembly is arranged in the premixing chamber (1) and is located at the air outlet end of the air inlet pipe (10), the air injection assembly comprises the exhaust sleeve (2) which is movably arranged in the premixing chamber (1) and communicated with the air injection pipe (12), and the water injection pipe (3) is communicated with one side of the air injection pipe (12).

2. A premix device to assist combustion of methanol as claimed in claim 1 wherein: A connecting hole (100) is arranged on one side of the premixing chamber (1), a support (101) is arranged in the connecting hole (100), a first bearing (102) is arranged in the middle part of the support (101), a first connecting rod (103) is sleeved on the middle ring of the first bearing (102), a first fan blade (104) is arranged on the outer side wall of the first connecting rod (103) in the circumferential direction, one side of the air inlet pipe (10) is communicated with the air pump (105), and the other side of the air inlet pipe (10) is communicated with the outer side hole of the connecting hole (100).

3. A premix device to assist combustion of methanol as claimed in claim 2 wherein: The air injection assembly comprises the air injection pipe (12) which is arranged in the premixing chamber (1), the reciprocating motor (21) which is arranged outside the premixing chamber (1) and below the connecting hole (100), the lead screw (22) which is horizontally arranged in the premixing chamber (1) and connected with the output end of the reciprocating motor (21), the connecting block (23) which is screwed with the lead screw (22), and the exhaust sleeve (2) which is fixedly connected with the connecting block (23), a boss (24) is arranged on one side of the exhaust sleeve (2), a through hole is arranged on the boss (24), and a guide rod (25) is arranged in the through hole and connected with the inner wall of the premixing chamber (1).

4. A premix device to assist combustion of methanol as claimed in claim 3 wherein: The exhaust sleeve (2) comprises the lower concave cavity (26) which is circular-arc-shaped and screwed with the connecting block (23), and the upper concave cavity (27) which is screwed with the lower concave cavity (26), the inner side walls of the upper concave cavity (27) and the lower concave cavity (26) are combined to form a circular-arc-shaped cavity structure, the air injection pipe (12) is arranged on one side of the lower concave cavity (26) and communicated with the cavity structure, and a plurality of air outlet holes (271) are arranged on the upper concave cavity (27) in the circular-arc direction and communicated with the cavity structure.

5. A premix device to assist in the combustion of methanol as claimed in claim 4 wherein: A baffle plate (28) is arranged on the inner side wall of the premixing chamber (1), the upper end surface of the baffle plate (28) is arranged in abutment with the lower end surface of the connecting block (23), a first connecting plate (281) is vertically arranged on one side of the baffle plate (28) and fixedly connected with the inner side wall of the premixing chamber (1) and used for the lead screw (22), and a second connecting plate (282) is vertically arranged on the other side of the baffle plate (28) and used for limiting the movement of the connecting block (23).

6. A premix device to assist combustion of methanol as claimed in claim 5 wherein: A first telescopic pipe (291) is arranged outside the lead screw (22) at the position between the first connecting plate (281) and the connecting block (23) and between the connecting block (23) and the second connecting plate (282), and the two ends of the two sections of the first telescopic pipe (291) are respectively in abutment with the end face of the corresponding end of the first connecting plate (281), the connecting block (23) and the second connecting plate (282); a second telescopic pipe (292) is arranged outside the guide rod (25) between the boss (24) and the inner side wall of the premixing chamber (1), and the two ends of the second telescopic pipe (292) are respectively in abutment with the boss (24) and the inner side wall of the premixing chamber (1).

7. A premix device to assist combustion of methanol as claimed in claim 5 wherein: A screw hole is arranged on the cavity opening end face of the lower concave cavity (26), a bent section (272) is arranged on the cavity opening end face of the upper concave cavity (27), the upper concave cavity (27) is buckled on the upper end of the lower concave cavity (26), the lower end face of the bent section (272) is in abutment with the cavity opening end face of the lower concave cavity (26), a bolt is arranged through the bent section (272) and is screwed with the screw hole, and the nut of the bolt is in abutment with the upper end face of the bent section (272).

8. A premix device to assist combustion of methanol as claimed in claim 5 wherein: A tapered wall is arranged on one side of the inner wall of the premixing chamber (1), a gas collecting hole (30) is arranged at the narrow end of the tapered wall, and a support sleeve (301) is fixedly arranged in the gas collecting hole (30); the rotating stirring mechanism comprises a second support (31) embedded in the gas collecting hole (30), a second bearing (32) arranged on the second support (31), a second connecting rod (33) arranged on the middle ring of the second bearing (32) and sleeved with a second fan blade (331), and a gas guide sleeve (34) connected with the second connecting rod (33) and located in the gas collecting hole (30), wherein at least one obliquely arranged gas outlet through hole (341) is arranged on the gas guide sleeve (34) in the circumferential direction; in use, the gas flow input into the gas collecting hole (30) drives the second fan blade (331) to rotate, and synchronously drives the gas guide sleeve (34) to rotate so that the gas enters the cylinder (4) in a spiral rotating manner.

9. A premix device to assist combustion of methanol as claimed in claim 4 wherein: The gas injection pipe (12) protrudes from the premixing chamber (1), a three-way valve (121) is arranged in communication with the protruding end of the gas injection pipe (12), one side of the three-way valve (121) is connected with the water pump through the water injection pipe (3), the other side of the three-way valve (121) is connected with the methanol gas tank (123) through the connecting pipe (122), and a heating sleeve (124) is arranged on the outer side wall of the connecting pipe (122); the connecting pipe (122) and the water injection pipe (3) are each provided with a switch valve (13).

10. A premix device to assist combustion of methanol as claimed in claim 1 wherein: A drain valve (14) is arranged at the lower end of the premixing chamber (1); the gas outlet end of the exhaust valve (11) is in communication with the reaction cylinder (35), the reaction cylinder (35) is filled with sodium hydroxide solution, and an adsorption pipe (36) is arranged in communication with one side of the reaction cylinder (35), and the adsorption pipe (36) is filled with activated carbon.

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